On Thu, May 12, 2011 at 04:38:17PM +0300, Avi Kivity wrote:
> On 05/12/2011 04:06 PM, Joerg Roedel wrote:
>> AMD processors don't implement that cpuid leaf.
>
> Right. But if an AMD processor were to implement that leaf, it would be
> in a compatible manner, yes?
No official statement, but I guess this is the case. I have to check
back, though.
> A paravirt PMU also has to be implemented on top of perf_events.
> Otherwise we can't share this resource. So the only question is what
> the interface looks like. The arch pmu is non-optimized, but well
> specified and somewhat supported in guests. A paravirt pmu is not so
> well specified at this point but can be faster (less exits).
I agree that getting the interface right is certainly the most difficult
and important task here.
Joerg
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